Experimental Study on CO₂ Capture from Simulated Flue Gas with an Adsorption–Hydration Method
2021
Mu, Liang | Zhang, Qingyun | Cui, Qingyan
As global warming intensifies, it has become urgent to reduce greenhouse gas emissions. In this work, an adsorption–hydration method was employed to separate carbon dioxide (CO₂) from simulated flue gas by dispersing 1.0 mol % aqueous tetrahydrofuran solution in activated carbon, which resulted in the formation of hydrates. The hydrate phase equilibrium data was measured for determining the appropriate operating conditions. Four activated carbons (1#, 2#, 3#, and 4#) with different particle sizes were used as dispersion media under the condition of the same water content. Wet activated carbon 2# (50.0 wt % water content) showed the best performance. After separation, the CO₂ concentration in equilibrium gas phase decreased from 20.86 to 3.07 mol %, and its recovery reached 90.35% at 274.15 K and 2.302 MPa. Then, the effects of water content and initial gas–solid ratio were examined. The results demonstrated that the variations in water content within the range 20.81–60.43 wt % had almost no effect on the adsorption process at 274.15 K and an initial pressure of 3.5 MPa. However, excess water lowered the hybrid separation efficiency. At a certain water content, there existed an optimum initial gas–solid ratio, which was favorable for CO₂ recovery. The recycling of wet activated carbons was conducted, and the results indicated that their working capacities did not change after recycling. This study contributes to better understanding of CO₂ capture from flue gas with an adsorption–hydration method and also offers the optimization of an adsorption–hydration process.
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